package com.FileIo;

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.regex.Pattern;

/**
 * @author 13699
 */
public class DirList3 {
    public static void main(String[] args) {
        File path=new File(".");
        String[] list;
        if(args.length==0){
            list=path.list();
        }else{
            list=path.list(new FilenameFilter() {
                private Pattern pattern=Pattern.compile(args[0]);
                @Override
                public boolean accept(File dir, String name) {
                    return pattern.matcher(name).matches();
                }
            });
        }
        Arrays.sort(list,String.CASE_INSENSITIVE_ORDER);
        for (String dirItem:
             list) {
            System.out.println(dirItem);
        }
    }
}
